<template>
  <view>
    <view class="search-box">
      <uni-search-bar ref="searchBarRef"  :focus="true" placeholder="请输入搜索内容" cancelButton="none"  @input="input" :radius="100">搜索</uni-search-bar>
    </view>
    <!-- 搜索列表建议 -->
    <view class="sugg-list" v-show="searchResults.length">
      <view class="sugg-item" v-for="(item,index) in searchResults" :key="index" @click="gotoDetail(item)">
        <view class="goods-name">{{item.goods_name}}</view>
          <uni-icons type="arrowright" size="16"></uni-icons>
      </view>
    </view>
    <!-- 搜索历史 -->
    <view class="history-box" v-show="!searchResults.length">
      <!-- 标题区 -->
      <view class="history-title">
        <text>搜索历史</text>
        <uni-icons type="trash" size="17" @click="clean"></uni-icons>
      </view>
      <!-- 列表区 -->
      <view class="history-list">
        <uni-tag :text="item"  v-for="(item,index) in historyList" :key="index" @click="gotoGoodsList(item)"></uni-tag>
      </view>
    </view>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        timer:null,
        kw:'',
        // 搜索的结果列表
        searchResults:[],
        // 搜索历史的数组
        historyList:[]

      };
    },
    onLoad(){
      this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
    },
    methods:{
      // input输入事件的处理函数
      input(value){
        clearTimeout(this.timer)
        this.timer = setTimeout(()=>{
          this.kw = value
          this.getSearchList()
        },500)
      },
      async getSearchList(){
        // 判断搜索关键词是否为空
        if(this.kw.length === 0){
          this.searchResults = []
          return
        }
        const res = await uni.$http.get('api/public/v1/goods/qsearch',{query:this.kw})
        if(res.data.meta.status !== 200) return uni.$showMsg()
        this.searchResults = res.data.message
      },
      async gotoDetail(item){
        const refInput = this.$refs.searchBarRef
        refInput.clear()
        this.saveSearchHistory()
        uni.navigateTo({
          url:'/subpkg/goods_detail/goods_detail?goods_id='+item.goods_id
        })
      },
      // 保存历史记录
      saveSearchHistory(){
        this.historyList.unshift(this.kw)
        // 数组去重，很方便
        this.historyList = [...new Set(this.historyList)]
        // 对搜索历史数据进行持久化
        uni.setStorageSync('kw',JSON.stringify(this.historyList))
      },
      // 清空记录
      clean(){
        this.historyList = []
        uni.setStorageSync('kw','')
      },
      gotoGoodsList(kw){
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?query=' + kw
        })
      }
    }
  }
</script>

<style lang="scss">
.search-box{
  position: sticky;
  top: 0;
  z-index: 999;
}
.sugg-list{
  padding: 0 5px;
  .sugg-item{
    display: flex;
    padding: 13px 0;
    align-self: center;
    justify-content: space-between;
    font-size: 12px;
    border-bottom: 1px solid #efefef;
    .goods-name{
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }
  }

}
.history-box{
  padding: 0 5px;
  .history-title{
    display: flex;
    justify-content: space-between;
    height: 40px;
    line-height: 40px;
    font-size: 13px;
    border-bottom: 1px solid #efefef;
  }
  .history-list{
    display: flex;
    flex-wrap: wrap;
    
    .uni-tag{
      margin-top: 5px;
      margin-right: 5px;
    }
  }
}
</style>
